Looking at the schema definition for ECKeyValue, we seem to assume
that ECParametersType is defined in the /2000/09/xmldsig# namespace.
Shouldn't the schema snippet be using the /2009/xmldsig11 namespace,
both for its elements and for the types?
http://www.w3.org/2008/xmlsec/Drafts/xmldsig-core-11/Overview.htm#sec-ECKeyValue
Related to that, I'm right now looking into cleaning up the material
on namespaces and entities in section 1.3. We'll probably also need
to consider some of the stuff in section 4, where namespaces and
entities used throughout the schema are defined.
Regards,
--
Thomas Roessler, W3C <tlr@w3.org>